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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,41 @@ | ||
| const EventEmitter = require("events"); | ||
| const Net = require("net"); | ||
| const { pb, id_to_type } = require("./messages"); | ||
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|
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| class FrameHelper extends EventEmitter { | ||
| constructor(host, port) { | ||
| super(); | ||
| this.host = host; | ||
| this.port = port; | ||
| this.buffer = Buffer.from([]); | ||
| this.socket = new Net.Socket(); | ||
| this.socket.on("close", () => this.emit("close")); | ||
| this.socket.on("error", (e) => { | ||
| this.emit("error", e); | ||
| this.socket.end(); | ||
| }); | ||
| } | ||
|
|
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| connect() { | ||
| this.socket.connect(this.port, this.host); | ||
| } | ||
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|
||
| end() { | ||
| this.socket.end(); | ||
| } | ||
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|
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| destroy() { | ||
| this.socket.destroy(); | ||
| } | ||
|
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| removeAllListeners() { | ||
| this.socket.removeAllListeners(); | ||
| super.removeAllListeners(); | ||
| } | ||
|
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| buildMessage(messageId, bytes) { | ||
| return pb[id_to_type[messageId]].deserializeBinary(bytes); | ||
| } | ||
| } | ||
|
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| module.exports = FrameHelper; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,136 @@ | ||
| const FrameHelper = require("./frameHelper"); | ||
| const createNoise = require("@richardhopton/noise-c.wasm"); | ||
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| //const getAsciiBytes = (value) => new Uint8Array(Object.keys(value).map((i) => value.charCodeAt(i))); | ||
| const HANDSHAKE_HELLO = 1; | ||
| const HANDSHAKE_HANDSHAKE = 2; | ||
| const HANDSHAKE_READY = 3; | ||
| const HANDSHAKE_CLOSED = 4; | ||
|
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| class NoiseFrameHelper extends FrameHelper { | ||
| constructor(host, port, encryptionKey, expectedServerName) { | ||
| super(host, port); | ||
| this.encryptionKey = encryptionKey; | ||
| this.expectedServerName = expectedServerName; | ||
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| this.handshakeState = HANDSHAKE_HELLO; | ||
| this.socket.on("data", (data) => this.onData(data)); | ||
| this.socket.on("connect", async () => await this.onConnect()); | ||
| this.socket.on("close", () => this.handshakeState = HANDSHAKE_CLOSED); | ||
| } | ||
|
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| async onConnect() { | ||
| const psk = Buffer.from(this.encryptionKey, "base64"); | ||
| const noise = await new Promise((res) => createNoise(res)); | ||
| this.client = noise.HandshakeState( | ||
| "Noise_NNpsk0_25519_ChaChaPoly_SHA256", | ||
| noise.constants.NOISE_ROLE_INITIATOR | ||
| ); | ||
| this.client.Initialize( | ||
| new Uint8Array(Buffer.from("NoiseAPIInit\x00\x00")), | ||
| null, | ||
| null, | ||
| new Uint8Array(psk) | ||
| ); | ||
| this.write([]); | ||
| } | ||
|
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| extractFrameBytes() { | ||
| if (this.buffer.length < 3) return null; | ||
| const indicator = this.buffer[0]; | ||
| if (indicator != 1) | ||
| throw new Error("Bad format. Expected 1 at the begin"); | ||
|
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| const frameEnd = 3 + ((this.buffer[1] << 8) | this.buffer[2]); | ||
| if (this.buffer.length < frameEnd) return null; | ||
| const frame = this.buffer.subarray(3, frameEnd); | ||
| this.buffer = this.buffer.subarray(frameEnd); | ||
| return frame; | ||
| } | ||
|
|
||
| onData(data) { | ||
| this.emit("data", data); | ||
| this.buffer = Buffer.concat([this.buffer, data]); | ||
| let frame; | ||
| while ((frame = this.extractFrameBytes())) { | ||
| switch (this.handshakeState) { | ||
| case HANDSHAKE_HELLO: | ||
| return this.handleHello(frame); | ||
| case HANDSHAKE_HANDSHAKE: | ||
| return this.handleHandshake(frame); | ||
| default: | ||
| const message = this.deserialize(this.decryptor.DecryptWithAd([], frame)); | ||
| return this.emit("message", message); | ||
| } | ||
| } | ||
| } | ||
|
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| handleHello(serverHello) { | ||
| const chosenProto = serverHello[0]; | ||
| if (chosenProto != 1) | ||
| throw new Error( | ||
| `Unknown protocol selected by server ${chosenProto}` | ||
| ); | ||
| if (!!this.expectedServerName) { | ||
| const serverNameEnd = serverHello.indexOf("\0", 1); | ||
| if (serverNameEnd > 1) { | ||
| const serverName = serverHello | ||
| .subarray(1, serverNameEnd) | ||
| .toString(); | ||
| if (this.expectedServerName != serverName) | ||
| throw new Error(`Server name mismatch, expected ${this.expectedServerName}, got ${serverName}`); | ||
| } | ||
| } | ||
|
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| this.handshakeState = HANDSHAKE_HANDSHAKE; | ||
| this.write([0, ...this.client.WriteMessage()]); | ||
| } | ||
|
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| handleHandshake(serverHandshake) { | ||
| const header = serverHandshake[0]; | ||
| const message = serverHandshake.subarray(1); | ||
| if (header != 0) { | ||
| throw new Error(`Handshake failure: ${message.toString()}`); | ||
| } | ||
| this.client.ReadMessage(message, true); | ||
| [this.encryptor, this.decryptor] = this.client.Split(); | ||
| this.handshakeState = HANDSHAKE_READY; | ||
| this.emit("connect"); | ||
| } | ||
|
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| serialize(message) { | ||
| const encoded = message.serializeBinary(); | ||
| const messageId = message.constructor.id; | ||
| const messageLength = encoded.length; | ||
| const buffer = Buffer.from([ | ||
| (messageId >> 8) & 255, | ||
| messageId & 255, | ||
| (messageLength >> 8) & 255, | ||
| messageLength & 255, | ||
| ...encoded, | ||
| ]); | ||
| return buffer; | ||
| } | ||
|
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| deserialize(buffer) { | ||
| if (buffer.length < 4) return null; | ||
| const messageId = (buffer[0] << 8) | buffer[1]; | ||
| const messageLength = (buffer[2] << 8) | buffer[3]; | ||
| const message = this.buildMessage(messageId, buffer.subarray(4, messageLength + 4)); | ||
| message.length = messageLength + 4; | ||
| return message; | ||
| } | ||
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| write(frame) { | ||
| const frameLength = frame.length; | ||
| const header = [1, (frameLength >> 8) & 255, frameLength & 255]; | ||
| const payload = Buffer.from([...header, ...frame]); | ||
| this.socket.write(payload); | ||
| } | ||
|
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| sendMessage(message) { | ||
| this.write(this.encryptor.EncryptWithAd([], this.serialize(message))); | ||
| } | ||
| } | ||
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| module.exports = NoiseFrameHelper; |
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